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Orientador(es)
Resumo(s)
To determine the drivers of phytoplankton biomass, we collected standardized morphometric, physical, and
biological data in 230 lakes across the Mediterranean, Continental, and Boreal climatic zones of the European
continent. Multilinear regression models tested on this snapshot of mostly eutrophic lakes (median total phosphorus
[TP] = 0.06 and total nitrogen [TN] = 0.7 mg L-1), and its subsets (2 depth types and 3 climatic zones),
show that light climate and stratification strength were the most significant explanatory variables for chlorophyll
a (Chl a) variance. TN was a significant predictor for phytoplankton biomass for shallow and continental
lakes, while TP never appeared as an explanatory variable, suggesting that under high TP, light, which partially
controls stratification strength, becomes limiting for phytoplankton development. Mediterranean lakes were the
warmest yet most weakly stratified and had significantly less Chl a than Boreal lakes, where the temperature
anomaly from the long-term average, during a summer heatwave was the highest (+4 C) and showed a significant,
exponential relationship with stratification strength. This European survey represents a summer snapshot
of phytoplankton biomass and its drivers, and lends support that light and stratification metrics, which are both
affected by climate change, are better predictors for phytoplankton biomass in nutrient-rich lakes than nutrient
concentrations and surface temperature.
Descrição
Palavras-chave
Phytoplankton biomass Mediterranean
Contexto Educativo
Citação
Donis, Daphne; Mantzouki, Evanthia; Geraldes, Ana Maria, ...[et al.] (2021). Stratification strength and light climate explain variation in chlorophyll a at the continental scale in a European multilake survey in a heatwave summer. Limnology and Oceanography. ISSN 1939-5590. p. 1-21
Editora
ASLO